TheWrap compares season-over-season and May sweep numbers across broadcast's late night
Diane Sawyer becomes first female solo anchor on a news broadcast to win in sweeps in key news demo
"Survivor: Heroes vs. Villains," "Mentalist" strong; "Vampire Diaries" ends season on high note
TV viewership is up for Tuesday night
Fox still wins the demo race; NBC takes second place
CBS has convincing win to start sweeps; ABC places second with strong "Grey's Anatomy" showing
Plus "Lost," "V," lots of guest stars and a new "Bachelorette"